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Phys Rev Lett. 2014 Jul 11;113(2):024801. Epub 2014 Jul 10.

Free-electron laser design for four-wave mixing experiments with soft-x-ray pulses.

Author information

1
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
2
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
3
Argonne National Laboratory, Argonne, Illinois 60439, USA.

Abstract

We present the design of a single-pass free-electron laser amplifier suitable for enabling four-wave mixing x-ray spectroscopic investigations. The production of longitudinally coherent, single-spike pulses of light from a single electron beam in this scenario relies on a process of selective amplification where a strong undulator taper compensates for a large energy chirp only for a short region of the electron beam. This proposed scheme offers improved flexibility of operation and allows for independent control of the color, timing, and angle of incidence of the individual pulses of light at an end user station. Detailed numerical simulations are used to illustrate the more impressive characteristics of this scheme.

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